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Camber Tolerances

Camber is the measured deviation of the side of a sheet from a straight edge. Camber is caused by one side of a sheet being elongated more than the other side during perforation or leveling. Camber often results from having unequal side margins on a sheet.

  • Camber is measured by placing a straight edge along the concave side of the sheet and measuring the maximum distance from the straight edge to the edge of the sheet (Figure 1).
  • A sheet can be sheared after it is perforated and leveled, which will make the sheet square, but the perforated pattern will still be cambered on the sheet (Figure 2).
  • If sheets are cut after perforation, the camber refers only to the perforated pattern. (See sketch below F & G)
  • Designers are requested to avoid different margins whenever possible.
Camber figure 1Camber figure 2

Maximum Camber

Maximum camber all metals after perforating: 

Coils & Cut Length Ft. Commerical Quality Superior Quality Special Quality
To 4 Ft. Inclusive 1/8" 4' = .062"
Over 4-6 Ft. Inclusive 3/16" 5' = .098"
Over 6-8 Ft. Inclusive 1/2" 6' = .140"